Testing empty URI
 scheme UNDEFINED
 authority UNDEFINED
 userinfo UNDEFINED
 host UNDEFINED
 port UNDEFINED
 path: 
     segment: 
 query UNDEFINED
 fragment UNDEFINED
                                                                                                     

 All parts defined
 scheme: http
 authority: uname:pass@www.example.org:80
 userinfo: uname:pass
 host: www.example.org
 port: 80
 path: /dir1/dir2/test.html
     segment: /
     segment: dir1/
     segment: dir2/
     segment: test.html
 query: a=b;c=d
 fragment: frag
 http://uname:pass@www.example.org:80/dir1/dir2/test.html?a=b;c=d#frag                               

 No #frag
 scheme: http
 authority: uname:pass@www.example.org:80
 userinfo: uname:pass
 host: www.example.org
 port: 80
 path: /dir1/dir2/test.html
     segment: /
     segment: dir1/
     segment: dir2/
     segment: test.html
 query: a=b;c=d
 fragment UNDEFINED
 http://uname:pass@www.example.org:80/dir1/dir2/test.html?a=b;c=d                                    

 No ?query
 scheme: http
 authority: uname:pass@www.example.org:80
 userinfo: uname:pass
 host: www.example.org
 port: 80
 path: /dir1/dir2/test.html
     segment: /
     segment: dir1/
     segment: dir2/
     segment: test.html
 query UNDEFINED
 fragment: frag
 http://uname:pass@www.example.org:80/dir1/dir2/test.html#frag                                       

 No /path
 scheme: http
 authority: uname:pass@www.example.org:80
 userinfo: uname:pass
 host: www.example.org
 port: 80
 path: 
     segment: 
 query: a=b;c=d
 fragment: frag
 http://uname:pass@www.example.org:80?a=b;c=d#frag                                                   

 No :port
 scheme: http
 authority: uname:pass@www.example.org
 userinfo: uname:pass
 host: www.example.org
 port UNDEFINED
 path: /dir1/dir2/test.html
     segment: /
     segment: dir1/
     segment: dir2/
     segment: test.html
 query: a=b;c=d
 fragment: frag
 http://uname:pass@www.example.org/dir1/dir2/test.html?a=b;c=d#frag                                  

 No user@
 scheme: http
 authority: www.example.org:80
 userinfo UNDEFINED
 host: www.example.org
 port: 80
 path: /dir1/dir2/test.html
     segment: /
     segment: dir1/
     segment: dir2/
     segment: test.html
 query: a=b;c=d
 fragment: frag
 http://www.example.org:80/dir1/dir2/test.html?a=b;c=d#frag                                          

 No pass
 scheme: http
 authority: uname@www.example.org:80
 userinfo: uname
 host: www.example.org
 port: 80
 path: /dir1/dir2/test.html
     segment: /
     segment: dir1/
     segment: dir2/
     segment: test.html
 query: a=b;c=d
 fragment: frag
 http://uname@www.example.org:80/dir1/dir2/test.html?a=b;c=d#frag                                    

 No scheme
 scheme UNDEFINED
 authority UNDEFINED
 userinfo UNDEFINED
 host UNDEFINED
 port UNDEFINED
 path: uname@www.example.org:80/dir1/dir2/test.html
     segment: uname@www.example.org:80/
     segment: dir1/
     segment: dir2/
     segment: test.html
 query: a=b;c=d
 fragment: frag
 uname@www.example.org:80/dir1/dir2/test.html?a=b;c=d#frag